Skip None values in fixed_ips when creating Port

Neutron create port doesn't like when a None value is passed for
fixed_ips data, the value needing to be skipped instead. This patch
handles that problem for ip_address and subnet_id, as testing showed
that subnet_id wasn't mandatory.

Change-Id: I18a06cbad456eb75c41c299bc4c51c704d9dabc3
Closes-Bug: #1224472
Make availability zone for CinderVolume optional

So if end user does not specify, default availability zone will be
used.

Fixes bug #1231346

Change-Id: I54c8c714062916cb78c8762829411eaa73d609f8
Return parsed list value in CommaDelimitedList

What's `Ref' got from `CommaDelimitedList' parameter is unicode
string, so failed validation in properties.

The solution here is add list value in `CommaDelimitedList'.

Fixes bug #1226483

Change-Id: I5534ff6027d6f5be3a844778d025b73ab9500796
Imported Translations from Transifex

Change-Id: I45b1a31c0fdb17fa5110af58065c1c45e4e8125f
Merge "Make availability zone for CinderVolume optional"
Merge "Imported Translations from Transifex"
Merge "Skip None values in fixed_ips when creating Port"
Merge "Return parsed list value in CommaDelimitedList"